One video from 2012 even shows one patiently letting a diver pull a fishing hook out of its mouth.

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But don’t get too excited about striking up a beautiful interspecies friendship. Almost all fish in the puffer family carry tetrodotoxin, a neurotoxin that National Geographiccalls 1,200 times more poisonous than cyanide.

Just one fish can contain enough of this toxin to kill 30 adult humans, and there is no known antidote.

The giant puffer fish has one of the most adorable faces in the ocean. This one was very fascinated with the camera and he stares into it, giving an interesting view of the saucer like eyes. These fish can’t swim quickly but they can inflate large enough that they can’t be swallowed.

Learn about how you can help vulnerable marine animals by signing up with Oceana.